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EDG Data Set Name	Granule Shortname
MODIS/Aqua Observation Pointers Daily L2G Global 250m SIN Grid	MYDPTQKM

Version	Acquisition Range	Science Quality Status
V003	March 6 2003 (2003065) - February 1 2004 (2004032)	Validated
V004	July 4 2002 (2002185)	Provisional as of July 4, 2002

Data Set Characteristics Area = ~ 10° x 10° lat/long Image Dimensions = 2 (4800x4800 row/column) Average File Size = 290 MB Resolution = 250 meters Projection = Sinusoidal Processing Level = 2G Data Format = HDF-EOS Science Data Sets (SDSs) = 7 Product Description The MODIS Level 2 Gridded (L2G) land data storage methodology was developed to satisfy the diverse needs of the MODIS land product generation algorithms, to enable efficient processing and reprocessing of MODIS land products, to facilitate the development of terrestrial remote sensing algorithms and science using MODIS land data, and to provide users with the original sensed MODIS observations and their sub-pixel geolocation information.

Color Observation Coverage White 0 to 10% Maroon 11 to 20% Magenta 21 to 30% Purple 31 to 40% Cyan 41 to 50% Blue 51 to 60% Green 61 to 70% Yellow 71 to 80% Orange 81 to 90% Red 91 to 100% Black Fill Color Number of Observations Black 0 Green 1 Blue 2 Red 3 Yellow 4 Magenta 5 Maroon 6

The L2G data structure stores information concerning the Level 2 (L2) observations that fall within each Level 3 (L3) grid cell over a 24 hour (GMT) period. The observation coverage, the area of the intersection of the observation and each overlapping grid cell in the tile, is computed and stored. The above images represent day-mode L2G information acquired over the western coast of North America on July 11, 2003. The first image is of the observation coverage and the second contains the number of observations per pixel. The original 250-m L2 product line and sample numbers of each observation are included. Offsets are provided to the corresponding observation in the coarser 500-km L2G files (MYDPTHKM, etc.) to allow 250-m products to be generated using information from the coarser resolutions. The observations stored in the L2G products are examined by the L3 processes to extract the most relevant observations falling over each grid cell.

NOTE: These products are validated, meaning that product uncertainties are well defined over a range of representative conditions. Although there may be later improved versions, these data are ready for use in scientific publications.

SDS	Units	Data Type -bit	Fill Value	Valid Range	Multiply by Scaling Factor	Calibrated _nt
Number of Observations	na	8-bit signed integer	-1	0 - 127	na	na
Observation coverage	%	8-bit signed integer	-1	0 - 100	0.01	5
Granule pointer	na	8-bit unsigned integer	255	0 - 254	na	na
Observation line number	na	16-bit unsigned integer	65535	0 - ~4800	na	na
Observation sample number	na	16-bit unsigned integer	65535	0 - ~4800	na	na
row and column offset in coarser grid	na	8-bit unsigned integer	136	0 - 255	na	na
observation number in coarser grid	na	8-bit unsigned integer	255	0 - 254	na	na

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MODIS/AQUA OBSERVATION POINTERS DAILY L2G GLOBAL 250M SIN GRID V004

EOS Data Gateway Search Tips

Source:	Aqua
Sensor:	MODIS
Dataset:	MODIS/Aqua Observation Pointers Daily L2G Global 250m SIN Grid
Spatial:	HORIZONTALTILENUMBER Max/Min VERTICALTILENUMBER Max/Min
Geographic Extent:	Type Lat/Long Range or Draw on Map
Temporal Extent:	2003-03-06 to 2004-02-01 (V003); 2002-07-04 to present (V004)

Product Information

Product Description - Not Available

User Guide - Not Available

Algorithm Theoretical Basis Document (ATBD)  (http://modis.gsfc.nasa.gov/data/atbd/land_atbd.php)

EOS Data Products Handbook Volume 2 (2000) (http://eospso.gsfc.nasa.gov/eos_homepage/for_scientists/data_products/vol2.php)

Contact Information

LP DAAC User Services U.S. Geological Survey (USGS) Earth Resources Observation and Science Center (EROS) 47914 252nd Street Sioux Falls, SD 57198-0001
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